==================================================================
BUG: KASAN: stack-out-of-bounds in get_reg arch/x86/kernel/unwind_orc.c:391 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x161c/0x1c60 arch/x86/kernel/unwind_orc.c:557
Read of size 8 at addr ffff8880ae607bf8 by task syz-executor304/32022

CPU: 0 PID: 32022 Comm: syz-executor304 Not tainted 4.19.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 get_reg arch/x86/kernel/unwind_orc.c:391 [inline]
 unwind_next_frame+0x161c/0x1c60 arch/x86/kernel/unwind_orc.c:557
 perf_callchain_kernel+0x3fa/0x5c0 arch/x86/events/core.c:2346
 get_perf_callchain+0x392/0x860 kernel/events/callchain.c:202
 perf_callchain+0x165/0x1c0 kernel/events/core.c:6448
 perf_prepare_sample+0x81e/0x1620 kernel/events/core.c:6475
 __perf_event_output kernel/events/core.c:6590 [inline]
 perf_event_output_forward+0xf3/0x270 kernel/events/core.c:6608
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7881
 perf_swevent_overflow kernel/events/core.c:7957 [inline]
 perf_swevent_event+0x4b9/0x550 kernel/events/core.c:7995
 perf_tp_event+0x29f/0xaa0 kernel/events/core.c:8413
 perf_trace_run_bpf_submit+0x144/0x220 kernel/events/core.c:8387
 perf_trace_lock_acquire+0x36b/0x530 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x298/0x3c0 kernel/locking/lockdep.c:3906
 rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
 rcu_read_lock include/linux/rcupdate.h:627 [inline]
 cpuacct_charge+0xa0/0x350 kernel/sched/cpuacct.c:347
 cgroup_account_cputime include/linux/cgroup.h:767 [inline]
 update_curr+0x2ce/0x870 kernel/sched/fair.c:858
 enqueue_entity+0xdba/0x3850 kernel/sched/fair.c:3955
 enqueue_task_fair+0x12e/0x2270 kernel/sched/fair.c:5177
 ttwu_activate kernel/sched/core.c:1639 [inline]
 ttwu_do_activate+0xce/0x1e0 kernel/sched/core.c:1698
 ttwu_queue kernel/sched/core.c:1843 [inline]
 try_to_wake_up+0x700/0x1050 kernel/sched/core.c:2052
 swake_up_locked kernel/sched/swait.c:30 [inline]
 swake_up_locked kernel/sched/swait.c:22 [inline]
 swake_up_one+0x71/0x1b0 kernel/sched/swait.c:40
 flush_smp_call_function_queue+0x297/0x4d0 kernel/smp.c:247
 smp_call_function_single_interrupt+0x98/0x440 arch/x86/kernel/smp.c:304
 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:916
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:kmem_cache_free+0x11c/0x260 mm/slab.c:3766
Code: 11 48 63 75 74 48 89 df e8 d1 46 c1 01 e9 68 ff ff ff e8 07 44 cf ff 48 83 3d 07 bb 32 07 00 0f 84 f8 00 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 eb 86 65 8b 05 d6 e0 61 7e 83 f8 3f 0f 87 e7 00 00
RSP: 0018:ffff88809fe0f920 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04
RAX: 0000000000000007 RBX: ffff88808d88c948 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff88821bc33c40 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282
R13: ffffffff81952682 R14: 000000000000104e R15: ffff888089f62240
 remove_vma+0x132/0x170 mm/mmap.c:180
 exit_mmap+0x359/0x530 mm/mmap.c:3102
 __mmput kernel/fork.c:1015 [inline]
 mmput+0x14e/0x4a0 kernel/fork.c:1036
 exit_mm kernel/exit.c:546 [inline]
 do_exit+0xab5/0x2b70 kernel/exit.c:874
 do_group_exit+0x125/0x310 kernel/exit.c:990
 get_signal+0x3f2/0x1f70 kernel/signal.c:2588
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446e29
Code: Bad RIP value.
RSP: 002b:00007fcbca35adb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dcc28 RCX: 0000000000446e29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc28
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007fff0ac9dc1f R14: 00007fcbca35b9c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0002b981c0 count:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000800(reserved)
raw: 00fffe0000000800 ffffea0002b981c8 ffffea0002b981c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880ae607a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880ae607b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880ae607b80: 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3
                                                                ^
 ffff8880ae607c00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880ae607c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================